There's a number of ways to grow mushrooms. You can buy mushroom spawn to grow in beds or boxes filled with manure or compost. Alternatively choose a 'mushroom growing kit' that usually includes the spawn and growing media (such as wood shavings or straw). If you have access to recently chopped logs, you can buy wooden dowels or plugs that have been impregnated with spawn, which you tap into pre-drilled holes in the log.